if the transponder in the trunk area fails, at least 20 have done it, you will be locked in the car, permanently. Solution, open the glove compartment, insert the fob in the big slot in the top back left, everything will unlock and the car can start. Advice, drive your XLR to the nearest GM dealer and leave it. My 2004 sat in the shop June to October while GM got around to building and testing new transponders. I bought a new Corvette.